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Guarantee needs_drop::<T>() thread-local variables are destroyed at a well-defined point

A-destructorsArea: Destructors (`Drop`, …)Area: Destructors (`Drop`, …)

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#147342 In rust-lang/rust;

· orlp opened on Oct 4, 2025

<code>thread_local!</code> doesn’t like types whose definitions cannot be written more than once

A-const-genericsArea: const generics (parameters and arguments)Area: const generics (parameters and arguments)

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#147103 In rust-lang/rust;

· Jules-Bertholet opened on Sep 27, 2025

<code>thread_local!</code> has some shadowing issues

A-hygieneArea: Macro hygieneArea: Macro hygiene

A-macrosArea: All kinds of macros (custom derive, macro_rules!, proc macros, ..)Area: All kinds of macros (custom derive, macro_rules!, proc macros, ..)

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#147006 In rust-lang/rust;

· Jules-Bertholet opened on Sep 24, 2025

Stack overflow when <code>tls_callback</code> called on <code>x86_64-pc-windows-gnu</code>

A-panicArea: Panicking machineryArea: Panicking machinery

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

S-has-bisectionStatus: A bisection has been found for this issueStatus: A bisection has been found for this issue

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#140798 In rust-lang/rust;

· Berrysoft opened on May 8, 2025

Run TLS destructors for wasm32-wasip1-threads make Node.js stuck

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

O-wasiOperating system: Wasi, Webassembly System InterfaceOperating system: Wasi, Webassembly System Interface

O-wasip1-threadsOperating system: *-wasmp1-threads, WASI Preview1 with atomics and threadsOperating system: *-wasmp1-threads, WASI Preview1 with atomics and threads

O-wasmTarget: WASM (WebAssembly), http://webassembly.org/Target: WASM (WebAssembly), http://webassembly.org/

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#137510 In rust-lang/rust;

· Brooooooklyn opened on Feb 24, 2025

Document thread_local behavior with foreign-created threads

A-docsArea: Documentation for any part of the project, including the compiler, standard library, and toolsArea: Documentation for any part of the project, including the compiler, standard library, and tools

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#136546 In rust-lang/rust;

· eloff opened on Feb 4, 2025

Heavy usage of TLS causes stack overflow

A-panicArea: Panicking machineryArea: Panicking machinery

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

Status: Open.

#136120 In rust-lang/rust;

· errangutan opened on Jan 27, 2025

<code>#[thread_local]</code>s are pessimized in <code>#[no_mangle]</code> functions

A-codegenArea: Code generationArea: Code generation

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-optimizationCategory: An issue highlighting optimization opportunities or PRs implementing suchCategory: An issue highlighting optimization opportunities or PRs implementing such

F-thread_local`#![feature(thread_local)]``#![feature(thread_local)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#136042 In rust-lang/rust;

· purplesyringa opened on Jan 25, 2025

<code>#[thread_local]</code> alignment broken on Windows, GNU ABI

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

F-thread_local`#![feature(thread_local)]``#![feature(thread_local)]`

I-unsoundIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/SoundnessIssue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness

O-windows-gnuToolchain: GNU, Operating system: WindowsToolchain: GNU, Operating system: Windows

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#135719 In rust-lang/rust;

· purplesyringa opened on Jan 19, 2025

#[thread_local] + #[no_mangle] produces a "symbol already defined" error on Windows targets

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

F-thread_local`#![feature(thread_local)]``#![feature(thread_local)]`

O-windowsOperating system: WindowsOperating system: Windows

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#134939 In rust-lang/rust;

· saethlin opened on Dec 30, 2024

Dependency of rustc_fluent_macros getting compiled with -Ztls-model=initial-exec

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-bugCategory: This is a bug.Category: This is a bug.

T-bootstrapRelevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap)

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#134863 In rust-lang/rust;

· bjorn3 opened on Dec 28, 2024

Tracking Issue for thread spawn hooks

A-threadArea: `std::thread`Area: `std::thread`

A-thread-localsArea: Thread local storage (TLS)Area: Thread local storage (TLS)

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-thread_spawn_hook`#![feature(thread_spawn_hook)]``#![feature(thread_spawn_hook)]`

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#132951 In rust-lang/rust;

· m-ou-se opened on Nov 12, 2024